cannot find -ll collect2: error: ld returned 1 exit status

Question

当我尝试在 cygwin 中使用 gcc lex.yy.c -ll 编译从 lex helloworld.l 生成的 lex.yy.c 文件时，我遇到了类似的错误。

helloworld.l包含

%%
[0-9]+ { printf("saw an integer:%s\n", yytext);}
[a-z]+ { printf("saw a lowercase character:%s\n", yytext);}
[A-Z]+ { printf("saw an uppercase character:%s\n", yytext);}
.|\n ;
%%

gcc lex.yy.c -ll 的输出是

/usr/lib/gcc/i686-pc-cygwin/10/../../../../i686-pc-cygwin/bin/ld: cannot find -ll
collect2: error: ld returned 1 exit status

请帮助我解决此错误并使其正常工作。谢谢！

Answer 1

如@rici所述

$ gcc lex.yy.c -lfl

$ ./a < helloworld.l
saw an integer:0
saw an integer:9
saw a lowercase character:printf
saw a lowercase character:saw
...

为什么？程序 lex 属于 flex 包并且导入库是 libfl.a

$ cygcheck -f /usr/bin/lex
flex-2.6.4-2

$ cygcheck -l flex | grep a$
/usr/lib/libfl.a

cannot find -ll collect2: error: ld returned 1 exit status

cannot find -ll collect2: error: ld returned 1 exit status

gcc

cygwin

ld

yacc

lex